[all-commits] [llvm/llvm-project] e92b7e: [CodeGen] Provide original IR type to CC lowering ...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e92b7e9641949f9d9c2ca8964c31a437272d15af
      https://github.com/llvm/llvm-project/commit/e92b7e9641949f9d9c2ca8964c31a437272d15af
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2025-08-11 (Mon, 11 Aug 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/CallingConvLower.h
    M llvm/include/llvm/CodeGen/GlobalISel/CallLowering.h
    M llvm/include/llvm/CodeGen/TargetCallingConv.h
    M llvm/lib/CodeGen/CallingConvLower.cpp
    M llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/CodeGen/TargetLoweringBase.cpp
    M llvm/lib/Target/AArch64/AArch64CallingConvention.cpp
    M llvm/lib/Target/AArch64/AArch64CallingConvention.h
    M llvm/lib/Target/AArch64/AArch64FastISel.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp
    M llvm/lib/Target/ARM/ARMCallingConv.h
    M llvm/lib/Target/ARM/ARMFastISel.cpp
    M llvm/lib/Target/Lanai/LanaiISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/MSP430/MSP430ISelLowering.cpp
    M llvm/lib/Target/Mips/MipsFastISel.cpp
    M llvm/lib/Target/Mips/MipsISelLowering.cpp
    M llvm/lib/Target/PowerPC/PPCCallingConv.h
    M llvm/lib/Target/PowerPC/PPCFastISel.cpp
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVCallingConv.cpp
    M llvm/lib/Target/RISCV/RISCVCallingConv.h
    M llvm/lib/Target/X86/GISel/X86CallLowering.cpp
    M llvm/lib/Target/X86/X86CallingConv.h
    M llvm/lib/Target/X86/X86FastISel.cpp
    M llvm/utils/TableGen/CallingConvEmitter.cpp

  Log Message:
  -----------
  [CodeGen] Provide original IR type to CC lowering (NFC) (#152709)

It is common to have ABI requirements for illegal types: For example,
two i64 argument parts that originally came from an fp128 argument may
have a different call ABI than ones that came from a i128 argument.

The current calling convention lowering does not provide access to this
information, so backends come up with various hacks to support it (like
additional pre-analysis cached in CCState, or bypassing the default
logic entirely).

This PR adds the original IR type to InputArg/OutputArg and passes it
down to CCAssignFn. It is not actually used anywhere yet, this just does
the mechanical changes to thread through the new argument.



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